Chromoly 4-pawl drivers for Profile Mini, Totem, Madera V2 BMX cassette hubs & Classic MTB 1-spd cassette hubs. Drivers include bearings & seals. Pawls, springs, & cogs not included. Drivers are RHD/LHD compatible. 9t, 10t, & 11t tooth drivers are for 1/8 width chains. Weight: -9t Chromo Driver: 102g/3.55oz -10t Chromo Driver: 117g/4.1oz -11t Chromo Driver: 134g/4.7oz